Title :
A Semi-Blind Pilot-Assisted Channel Estimation Algorithm in OFDM Systems
Author :
Su, Borching ; Vaidyanathan, P.P.
Author_Institution :
California Inst. of Technol., Pasadena
Abstract :
In this paper we study a new semi-blind channel estimation algorithm in orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme is an extension of a recently reported subspace-based blind channel estimation algorithm in cyclic prefix systems which requires very few received blocks. The semi-blind estimation algorithm is devised by using the information obtained both from the blind channel estimation method and a pure pilot-assisted method. The proposed algorithm uses a small amount of received data and can be applied to any types of communication constellations. Simulation results show that, with the same number of pilot samples, the semi-blind algorithm has a clear improvement in system performance over the pure pilot-assisted method. To achieve the same bit- error-rate performance, the proposed semi-blind algorithm uses fewer pilot samples.
Keywords :
OFDM modulation; channel coding; channel estimation; cyclic codes; error statistics; OFDM systems; bit error rate performance; communication constellations; cyclic prefix systems; orthogonal frequency division multiplexing systems; pilot-assisted method; semi-blind channel estimation algorithm; subspace-based blind channel estimation algorithm; Bandwidth; Blind equalizers; Channel estimation; Data communication; Digital communication; Frequency estimation; OFDM; Statistics; System performance; Transmitters;
Conference_Titel :
Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-2109-1
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2007.4487536